tide reached the peninsula about 12:30, crews put up signs closing the road outside of the dock town marina in redwood city. it's a scene repeated more frequently than in the past. paul is the harbor master. >> it gets deep here but dissipates quickly. >> reporter: the tides created a problem for alberto contreras whose car floated away during yesterday's king tide. >> when i opened the door, all water come in. >> reporter: how high do you think it was here? >> right up to the door. >> reporter: his family arrived to push the car out of harm's way today. in a study from 2009, the oakland-based pacific institute says san mateo county could be the hardest hit as sea levels continue to rise and water creeps ever further inland. the report says one approach it protect property over the long term would be to install dikes, dunes and seawalls or perhaps it is time to rethink long-term development. >> it doesn't seem very smart to build in very low-lying areas anymore. >> reporter: she is with the sierra club. >> should we really be putting people's lives and their entire life savings at risk? a c